figure (1);
hold on;
b = [1745 1249];
c = ['b-' 'c-'];
for i= 1:2
plot (a(:,b(i)),c(i));
end
hold off;
a(23,1745)
a(23,1249)
a(24,1745)
a(24,1249)
a(25,1745)
a(25,1249)

